Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
lam thuc » lam thuoc, am thuc, nam thuc
vinh cuu » dinh cuu, sinh cua, dinh cu
sach hoi » sach doi, sach moi, cach thoi
vat danh » va danh, van danh, luat danh
van lam » van nam
sach lo » sach dao, sach doi, sach moi
lang xa » lang ha, dang xay, lang van
vi cuu » vi luu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach lo) OR (sach hoi)) lang xa hoi. hieu van lam thuc vat danh ((vi cuu) or (vinh cuu)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach lo) OR (sach hoi)) lang xa hoi. hieu van lam thuc vat danh ((vi cuu) OR (vinh cuu)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach lo) OR (sach hoi)) lang xa hoi. hieu van lam thuc vat danh ((vi cuu) or (vinh cuu)) tre".
• Adding a wildcard symbol may retrieve word variants: tu ((sach lo) OR (sach hoi)) lang xa hoi. hieu van lam thuc vat danh ((vi cuu) or (vinh cuu)) tre*.